Kurayami (meaning "darkness") is a visual novel concentrating on dialogue and decision-making within the confined setting of a broken elevator and developing relationship between the hero and the young woman. Depending on the player's choices, their relationship will evolve in different ways, leading to different endings.

The game contains scenes with nudity and sexual situations.

On a cold Christmas night, the male hero of the game enters a large building, hoping to find a warm place. But the elevator he enters is malfunctioning. After a short while he finds himself trapped in the elevator, unable to get out. As his eyes adjust to the darkness, he realizes that a young woman is inside the elevator as well. The two must find a way out, and also learn about each other's lives in the process...